DevOps, CI/CD and Automation

Dear All,

Please me the syntax for RTF, my scenario is that

if column data is null then then make column in RED otherwise the value.

I am using the following code, for this it is displaying red for null value but original value is not coming, showing as null.

<?if:INVOICE_DATE=''?><xsl:attribute  xdofo:ctx="block" name="background-color">red</xsl:attribute> <?INVOICE_DATE?><?end if?>

thanks